MATLAB: Changing a .mat file for SPM batch process

batch processmatspm

I am trying to change SPM preprocessing parameters stored in a .mat file. I've figured out MATLAB doesn't seem to allow changing the values within the cell (it gave me strange errors indicating that the entire file no longer existed when I tried to change them). What would be the easiest way to edit these variables?

Best Answer

If you are trying to change just one variable within a .mat that contains many variables, then one route is to use the -append flag at the time you save the revised variable: http://www.mathworks.com/help/matlab/ref/save.html

Note that this will cause the .mat file to get longer; the old variables will not get deleted when you use -append, they will just not be used.

Another approach is to use the matfile class, which will probably need you to use -v7.3 files.

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You have three problems. The first is that the format descriptor needs to be in single quotes, the second is that you have to specify your file name as being .mat, otherwise the save function thinks your ‘my_result’ string is a variable (to which you have assigned nothing), and saves everything to the default ‘matlab.mat’ file. The third is that the arguments to save all have to be strings.

Try this:

my_result = sprintf('result_%d_%d.mat', data_start,data_end); %this will create a string result_1_20
save(my_result, 'result');

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